{"id":117386,"date":"2026-09-11T17:03:31","date_gmt":"2026-09-11T15:03:31","guid":{"rendered":"https:\/\/nilu.gnist.dev\/publikasjoner\/guv-long-term-measurements-of-total-ozone-column-and-effective-cloud-transmittance-at-three-norwegian-sites\/"},"modified":"2026-09-11T17:03:31","modified_gmt":"2026-09-11T15:03:31","slug":"guv-long-term-measurements-of-total-ozone-column-and-effective-cloud-transmittance-at-three-norwegian-sites","status":"publish","type":"nva_publication","link":"https:\/\/nilu.gnist.dev\/en\/publications\/guv-long-term-measurements-of-total-ozone-column-and-effective-cloud-transmittance-at-three-norwegian-sites\/","title":{"rendered":"GUV long-term measurements of total ozone column and effective cloud transmittance at three Norwegian sites"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Measurements of total ozone column and effective cloud transmittance have been performed since 1995 at the three Norwegian sites Oslo\/Kjeller, And\u00f8ya\/Troms\u00f8, and in Ny-\u00c5lesund (Svalbard). These sites are a subset of nine stations included in the Norwegian UV monitoring network, which uses ground-based ultraviolet (GUV) multi-filter instruments and is operated by the Norwegian Radiation and Nuclear Safety Authority (DSA) and the Norwegian Institute for Air Research (NILU). The network includes unique data sets of high-time-resolution measurements that can be used for a broad range of atmospheric and biological exposure studies. Comparison of the 25-year records of GUV (global sky) total ozone measurements with Brewer direct sun (DS) measurements shows that the GUV instruments provide valuable supplements to the more standardized ground-based instruments. The GUV instruments can fill in missing data and extend the measuring season at sites with reduced staff and\/or characterized by harsh environmental conditions, such as Ny-\u00c5lesund. Also, a harmonized GUV can easily be moved to more remote\/unmanned locations and provide independent total ozone column data sets. The GUV instrument in Ny-\u00c5lesund captured well the exceptionally large Arctic ozone depletion in March\/April 2020, whereas the GUV instrument in Oslo recorded a mini ozone hole in December 2019 with total ozone values below 200\u2009DU. For all the three Norwegian stations there is a slight increase in total ozone from 1995 until today. Measurements of GUV effective cloud transmittance in Ny-\u00c5lesund indicate that there has been a significant change in albedo during the past 25 years, most likely resulting from increased temperatures and Arctic ice melt in the area surrounding Svalbard.<\/p>\n","protected":false},"template":"","meta":{"_acf_changed":false,"_searchwp_excluded":"","_id":"","_status":"PUBLISHED","_sync_date":"2026-09-11 14:36:35","footnotes":""},"nva_tax_category":[1099],"class_list":["post-117386","nva_publication","type-nva_publication","status-publish","hentry","nva_tax_category-scientific-journal-publication"],"acf":[],"_links":{"self":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/117386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication"}],"about":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/types\/nva_publication"}],"version-history":[{"count":0,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_publication\/117386\/revisions"}],"wp:attachment":[{"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/media?parent=117386"}],"wp:term":[{"taxonomy":"nva_tax_category","embeddable":true,"href":"https:\/\/nilu.gnist.dev\/en\/wp-json\/wp\/v2\/nva_tax_category?post=117386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}